marty mccarry, physician of health from johns hopkins. a great institution. nice to see you, doctor. >> great to see you, jamie. jamie: there is lot of water out there. not a the low the heat either. carbon monoxide is a threat right now. tell us about it. >> people don't know about it. it is an odorless gas and generated from independent generators people bring in the homes or from stove tops. remember pipes can be dislodged whenever there is damage done. this gas seeps into homes. about 10% of all the deaths after katrina were from carbon monoxide poisoning. if you have trouble breathing, should have detector. if you're having trouble breathing or something doesn't seem right, you should get checked out. we're seeing a lot of carbon monoxide poisoning from people who don't sense it. jamie: i thought that the points that you raised were all very important. and we'll put up a full screen folks can have them in the back of their mind if they're feeling symptoms. mold fits in there certainly too with the breathing. hypothermia is something a lot of people are e